Progress MS-18
NamesProgress 79P
Mission typeISS resupply
COSPAR ID2021-098A
SATCAT no.49379
Mission duration215 days (planned)
194 days and 13 hours (in progress)
Spacecraft properties
SpacecraftProgress MS-18 No. 447
BusProgress MS
ManufacturerKSC Energia
Launch mass7,000 kg (15,000 lb)
Payload mass2,439 kg (5,377 lb)
Start of mission
Launch date28 October 2021, 00:00:32 UTC[1]
Launch siteBaikonur, Site 31/6
ContractorProgress Rocket Space Centre
End of mission
DisposalDeorbited (planned)
Decay date2022
Orbital parameters
Reference systemGeocentric orbit
RegimeLow Earth orbit
Docking with ISS
Docking portZvezda aft
Docking date30 October 2021, 01:31:19 UTC
Undocking date2022 (planned)
Time docked192 days and 11 hours (in progress)
Cargo and MLM Means of Attachment of Large payloads
Mass2,439 kg (5,377 lb) [2]
Pressurised1,509 kg (3,327 lb)
Fuel470 kg (1,040 lb)
Gaseous40 kg (88 lb)
Water420 kg (930 lb)
Progress ISS Resupply

Progress MS-18 (Russian: Прогресс МC-18), Russian production No. 447, identified by NASA as Progress 79P, is a Progress spacecraft launched by Roscosmos to resupply the International Space Station (ISS). This is the 170th flight of a Progress spacecraft.


The Progress MS is a uncrewed freighter based on the Progress-M featuring improved avionics. This improved variant first launched on 21 December 2015. It has the following improvements:[3][4][5][6]


On 3 February 2021, Roskosmos approved the updated flight program to the International Space Station for 2021, highlighted with the addition of two permanent modules to the Russian Segment of the outpost. A short tourist visit to the ISS at the end of the year also got the green light.[7]

A Soyuz-2.1a launched Progress MS-18 to the International Space Station from Baikonur Site 31 on 28 October 2021 on a two-day, 36 orbit rendezvous profile.[8][9][10] If the air leak repairs planned for Zvezda's PrK chamber (delivery of sealing patches aboard Progress MS-16 in February 2021) are successful, then 3 hours 20 minutes after the launch Progress MS-18 will attempt to automatically dock to Zvezda's aft port.[7]

The vehicle docked to the aft port of the Zvezda Service Module (SM), on 30 October 2021, at 01:31:19 UTC, and will remain in orbit for 215 days, supporting the Expedition 66 mission aboard the ISS.[11]


The Progress MS-18 spacecraft is loaded with 2,439 kg (5,377 lb) of cargo, with 1,509 kg (3,327 lb) of this being dry cargo.[2]

Means of attachment of large payloads

It also delivered MLM Means of Attachment of Large payloads to ISS. It is a 4 segment external payload interface called means of attachment of large payloads (Sredstva Krepleniya Krupnogabaritnykh Obyektov, SKKO)[12][13][14] Once the nadir end of SKKO is soft docked to Nauka and bolted down, the launch locks on SKKO will be released by the spacewalkers to allow it to be unfolded and extended with its joints self locking in the extended position to create a rigid frame. Then the Zenith end of SKKO is soft docked to Nauka and bolted down. The 3 passive payload adapters and the one active payload adapter (i.e. active remote sensing payload like MIR Priroda's Travers Synthetic Aperture Radar) are then outfitted. The SKKO is derived from the setup used on the Priroda module.[15] SKKO was launched inside the progress and transferred inside to a temporary storage location inside one of the station modules. It will be taken outside and installed on the aft facing side of Nauka during the VKD-59 spacewalk.[16][17]

Undocking and decay

The Progress MS-18 is scheduled to remain docked at the station till mid 2022, when it will depart with trash and re-enter the Earth's atmosphere for destruction over the South Pacific Ocean.

See also


  1. ^ "Progress MS-17 to make 24 hour long relocation at space station". 20 October 2021. Retrieved 21 October 2021.
  2. ^ a b "Russian Progress supply ship poised for launch from Baikonur". Spaceflight Now. 27 October 2021. Retrieved 27 October 2021.
  3. ^ Krebs, Gunter (1 December 2015). "Progress-MS 01-19". Gunter's Space Page. Retrieved 3 October 2020.
  4. ^ "Progress MS-18". NSSDCA. NASA. 10 February 2021. Retrieved 15 February 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  5. ^ Zak, Anatoly. "Progress-MS". Retrieved 3 October 2020.
  6. ^ Blau, Patrick (1 December 2015). "Progress MS Spacecraft". Retrieved 17 November 2020.
  7. ^ a b Zak, Anatoly (9 February 2021). "ISS set for the Russian expansion". Retrieved 9 February 2021.
  8. ^ Zak, Anatoly (10 October 2020). "Planned Russian space missions in 2021". Retrieved 13 October 2020.
  9. ^ "Launch Schedule". Spaceflight Now. 31 August 2020. Retrieved 3 October 2020.
  10. ^ "Status - Progress MS-18". NextSpaceflight. 1 September 2020. Retrieved 3 October 2020.
  11. ^ "Russian cargo freighter docks with International Space Station". Spaceflight Now. 30 October 2021. Retrieved 30 October 2021.
  12. ^ "Sredstva Krepleniya Krupnogabaritnykh Obyektov, SKKO".
  13. ^ "The Russian Nauka/Multipurpose Laboratory Module (MLM) General Thread". Retrieved 25 March 2022.
  14. ^ "Russia to bump its ISS crew back to three". Retrieved 25 March 2022.
  15. ^ Roscosmos. "MLM-U Structure diagram".
  16. ^ "VKD-59 spacewalk".
  17. ^[bare URL image file]